An Improved Design of Current Controller for &lt;italic&gt;LCL&lt;/italic&gt;-Type Grid-Connected Converter to Reduce Negative Effect of PLL in Weak Grid

Zhou, Shiying; Zou, Xudong; Zhu, Donghai; Li, Tong; Zhao, Yingying; Kang, Yong; Yuan, Xiaoming

doi:10.1109/jestpe.2017.2780918

Cited by 138 publications

(66 citation statements)

References 35 publications

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“…where P SC and P OW P P rated are the short-circuited capacity of the grid at the PCC and the rated generation power of the OWPP, respectively. Generally, the grid is weak when ≤ SCR ≤ 3 and very weak when SCR < 2 [18].…”

Section: A System Configurationmentioning

confidence: 99%

“…However, the high power factor condition is not commonly satisfied in practical application, since the GCIs are sometimes controlled to inject reactive power [12], [16], [17]. The recent study in [7], [18] shows that magnitude of cross-coupling term of the two-dimensional impedance matrix can be increased once reactive current reference is increased, whereas the quadrature-axis impedance which reflects the negative resistor feature of PLL in low-frequency range is not affected. In addition, stability analysis of the GCI considering outer power control loop is implemented in [19], where eigenvalue analysis indicates that controller parameters of the outer power control loop have an important effect on stability in low-frequency range.…”

Section: Introductionmentioning

confidence: 99%

“…However, only stability analysis methods of PV generators connected with weak grid are developed in [21]- [24], whereas no further stability enhancement strategies are explored. In [18], [25]- [30], dq impedance model of the GCI is reshaped to mitigate the negative effect of PLL on lowfrequency stability. In [18], the stability margin under weak grid condition is improved by optimizing current controller parameters.…”

Section: Introductionmentioning

confidence: 99%

“…In [18], [25]- [30], dq impedance model of the GCI is reshaped to mitigate the negative effect of PLL on lowfrequency stability. In [18], the stability margin under weak grid condition is improved by optimizing current controller parameters. In [25], [26], the stability margin under weak grid condition is improved by decreasing PLL bandwidth.…”

Section: Introductionmentioning

confidence: 99%

“…However, too large or too small grid voltage feed-forward coefficient can degrade system stability, which makes it difficult to select optimal value [30]. In addition, only inner current control loop and PLL, instead of outer power control loop, are considered in [18], [21]- [30].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of Reactive Power Characteristic of Offshore Wind Power Plant on Low-Frequency Stability

Zhou

Torres-Olguin

et al. 2020

IEEE Trans. Energy Convers.

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Oscillation phenomena of offshore wind power plant (OWPP) in a wide frequency range can be caused due to impedance interactions between grid-connected inverters (GCIs) and transmission cables. In this paper, impedance model of GCI with outer power control loop, inner current control loop and phase-locked loop is first established in dq reference frame. The correctness is validated by frequency scanning method. Then, the effects of active and reactive power/current references on dq impedance characteristics of GCI with/without consideration of power control loop are investigated using complex space vectors and complex transfer functions. Furthermore, RLC circuit model of transmission cable considering frequency-dependent characteristics is also established for dq-domain IBSC. On the basis of them, it's found that low-frequency oscillation phenomena of OWPP under power control mode may occur if active power reference exceeds a certain threshold value, which can be mitigated by injecting a certain amount of negative reactive power. Impacts of PLL parameters, length of transmission cable and number of paralleled GCIs on required negative reactive power for low-frequency stabilization are further investigated. Both Matlab/Simulink-based simulation and OPAL-RT-based real-time verification are implemented in an OWPP with four permanent magnet synchronous generators to validate the correctness of the reactive power characteristic analysis results and the feasibility of mitigating low-frequency oscillation phenomena by negative reactive power injection. Index Terms-Frequency scanning, grid-connected inverter, low-frequency stability, offshore wind power plant, reactive power, transmission cable.

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Section: A System Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Reactive Power Characteristic of Offshore Wind Power Plant on Low-Frequency Stability

Zhou

Torres-Olguin

et al. 2020

IEEE Trans. Energy Convers.

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Distributed damping reshaping control with constraints on dual stabilities for grid‐connected inverter in high penetration grid

Qi,

Zhao,

Sun

et al. 2023

Circuit Theory & Apps

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SummaryThe penetration level is limited by the occurrence of harmonic resonance under weakening grid. Under conventional current control, the penetrations with different power scheduling are assessed by the impedance Bode diagrams. To further suppress the current harmonics and improve the penetration with minimum cost, this paper proposes a distributed damping reshaping method by introducing the grid current feedback loop into the modulated wave of the inverter. The additional feedback loop is obtained by moving forward the feedback point of real damping link in hardware loop. Its equivalent control block has actual physical meaning, which helps to design damping coefficient. Further, instead of relying on the experience of engineer to select the damping coefficient, considering the effect of different values of damping on the inverter's performance, a damping design principle with the dual constraints on GCI's self‐stability and the global stability of the system is proposed. In detail, the range of the possible values of damping can be obtained by setting the desired system phase margin and the desired GCI's pole‐zero locations. In this range, the damping parameter, which remains the maximum ability of harmonic suppression for penetration improvement, can be determined by setting the desired damping ratio of the poles near the imaginary axis. Finally, simulations and experimental results were conducted to verify the correctness of the theoretical analysis.

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Analysis and Mitigation of Middle Frequency Resonance for Grid-Connected Inverter Under Weak Grid

Pan

2022

Lecture Notes in Electrical Engineering

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An Improved Design of Current Controller for <italic>LCL</italic>-Type Grid-Connected Converter to Reduce Negative Effect of PLL in Weak Grid

Cited by 138 publications

References 35 publications

Effect of Reactive Power Characteristic of Offshore Wind Power Plant on Low-Frequency Stability

Effect of Reactive Power Characteristic of Offshore Wind Power Plant on Low-Frequency Stability

Distributed damping reshaping control with constraints on dual stabilities for grid‐connected inverter in high penetration grid

Analysis and Mitigation of Middle Frequency Resonance for Grid-Connected Inverter Under Weak Grid

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